AVR-X4000 vahvistimelle "Recommended" arvosana AV Forums testissä. Lainauksia testistä:

"The build quality is excellent, with a well engineered feel and a very solid construction."

"The overall sound quality was excellent, with a detailed, lively and enjoyable surround experience that had plenty of bass presence…"

Koko arvostelu luettavissa täältä: http://www.avforums.com/review/denon-avr-x4000-av-receiver-review.9940